This is the Xylobot, our submission for the Berlin Music Hack Day, held on September 18-20 at Radialsystem V.
A custom Java app receives midi data from the step sequencer and controls the Arduino over a serial connection.
The board then triggers the servos to hit on the xylophone.
The whole construction was built in under 24 hours and is mostly made of hot glue and wood.

Made by Ramsey Arnaoot and myself

Check out the other awesome hacks @ berlin.musichackday.org/?page=Submissions